Patent US3693873A successfully refreshed from Google Patents.
US3693873A
Expired / Lapsed
US
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Flight path calculator
Assignee: Individual
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Filing: 1971-07-08
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Granted: 1972-09-26
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Expires: 1991-07-08
Abstract
Abstract A flight path calculator in the nature of a circular slide rule having first and second relatively movable scale bearing members. The first of such members is logarithmically scaled with numerical indicia interpretable either as having the dimension of vertical distance (feet) or the dimension of vertical speed (feet per minute) for respectively reading the same relative to a first logarithmic scale on the second member that carries numerical indicia of slope distance (nautical miles) and to a second logarithmic scale on the second member that carries numerical indicia of slope speed (knots). Means is provided for indicating the relative positions of the scale bearing members in terms of the slope angle appropriate to the relative settings of the vertical distance - slope distance scales or the vertical speed slope speed scales. Index markers and a cursor are provided to facilitate reading the indicia of the various scales.
Inventors
- 👤 Walter G H Otte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:52
CPC Classifications
G; G06; G06G; G06G1/00; G06G1/0005; G06G1/0052; G01; G01C; G01C21/00; G01C21/20
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
221 words
A slide rule for use in making aircraft ascent and descent calculations comprising relatively movable first and second members, said first member being graduated in a logarithmic scale of a given cycle length with indicia to give numerical readings ranging from less than 120 to above 2,000, said first member also being graduated in a scale and provided with numerical angular indicia to give angular readings ranging from below about 1* to above about 10*, a trigonometric function of which is equal to the corresponding numerical readings of the logarithmic scale when the latter readings are divided by a constant numerical factor selected to be in the range of about 1,000 to about 100,000, an index on the second member and operatively associated with the angular indicia, said second member being graduated in a first logarithmic scale of said given cycle length with indicia giving numerical readings ranging from less than 80 to above 150, said second member also being graduated in a second logarithmic scale of said given cycle length with indicia giving numerical readings, and said first and second scales of the second member being positioned relative to each other so that the numerical readings given by the first scale are the same as the corresponding numerical readings of the second scale when the latter are multiplied by 60.
Claim 2
Dependent Claim
221 words
A slide rule for use in making aircraft ascent and descent calculations comprising relatively movable first and second members, said first member being graduated in a logarithmic scale of a given cycle length with indicia to give numerical readings ranging from less than 120 to above 2,000, said first member also being graduated in a scale and provided with numerical angular indicia to give angular readings ranging from below about 1* to above about 10*, a trigonometric function of which is equal to the corresponding numerical readings of the logarithmic scale when the latter readings are divided by a constant numerical factor selected to be in the range of about 1,000 to about 100,000, an index on the second member and operatively associated with the angular indicia, said second member being graduated in a first logarithmic scale of said given cycle length with indicia giving numerical readings ranging from less than 80 to above 150, said second member also being graduated in a second logarithmic scale of said given cycle length with indicia giving numerical readings, and said first and second scales of the second member being positioned relative to each other so that the numerical readings given by the first scale are the same as the corresponding numerical readings of the second scale when the latter are multiplied by 60.
Claim 3
Dependent Claim
20 words
The combination of claim 1, including a second index on the second member and operatively associated with the angular indicia.
Claim 4
Dependent Claim
36 words
The combination of claim 1, wherein the second member is provided with a second index at the numerical position of unity on the second scale and operatively associated with the logarithmic scale on the first member.
Claim 5
Dependent Claim
26 words
The combination of claim 1, wherein the slide rule of the circular type, with the given cycle length subtends an angle less than about 180* .
Claim 6
Dependent Claim
26 words
The combination of claim 4, wherein the first and second members are discs with the latter being relatively smaller and disposed on top of the former.
Claim 7
Dependent Claim
15 words
The combination of claim 4, including a cursor operatively associated with all the logarithmic scales.
Claim 8
Dependent Claim
138 words
A slide rule calculator of the circular type for use in making aircraft ascent and descent calculations comprising first and second pivotally connected members, said first member being graduated in a logarithmic scale of a given cycle length and provided with numerical indicia as to a vertical flight component, said second member being provided with a logarithmic scale of said given cycle length and provided with numerical indicia as to a slope flight component, one of said members having a graduated scale with angular numerical indicia thereon that is the arc sin of the product of a constant factor and the numerical value of the indicia of such of said scales as is on said one member, and with the other of said members being provided with an index against which said numerical angular indicia can be read.
Claim 9
Dependent Claim
138 words
A slide rule calculator of the circular type for use in making aircraft ascent and descent calculations comprising first and second pivotally connected members, said first member being graduated in a logarithmic scale of a given cycle length and provided with numerical indicia as to a vertical flight component, said second member being provided with a logarithmic scale of said given cycle length and provided with numerical indicia as to a slope flight component, one of said members having a graduated scale with angular numerical indicia thereon that is the arc sin of the product of a constant factor and the numerical value of the indicia of such of said scales as is on said one member, and with the other of said members being provided with an index against which said numerical angular indicia can be read.
Claim 10
Dependent Claim
30 words
The combination of claim 7, wherein said first member is a disc and the second member is disposed on the top of the first member and is of smaller diameter.
Claim 11
Dependent Claim
22 words
The combination of claim 7, wherein the first member is said one member, and wherein the second member is said other member.
Claim 12
Dependent Claim
31 words
The combination of claim 7, wherein the vertical component has the dimension of distance in terms of feet, and wherein the slope component has the dimension of distance in nautical miles.
Claim 13
Dependent Claim
34 words
The combination of claim 7, wherein the vertical component has the dImension of velocity in terms of feet per minute, and wherein the slope component has the dimension of velocity in terms of knots.
Claim 14
Dependent Claim
54 words
The combination of claim 7, wherein the other of said members is provided with a second index against which said angular indicia can be read, whereby the angular indicia read against the first mentioned index and the second index respectively correspond to the use of English and metric units for the vertical flight component.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |